Bituminous composition.



UNITED STATES PATENT OFFICE.

AUGUST E. SCHUTTE, OF BELMONT, MASSACHUSETTS, ASSIGNOR TO IVARRENBROTHERS COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF WESTVIRGINIA.

BITUMINOUS COMPOSITION.

Specification of Letters Patent.

Patented Oct. 3, 1905.

Application filed June 21,1902. Serial No. 112,677.

A ful Improvement in the Production of Bituminous Compositions, of whichthe following is a full, clear, and exact description.

The invention relates to the production of bituminous compositionespecially adapted for use in the construction of pavements or roadways,but which is also capable of other uses.

It consists in combining with a bituminous ingredient, such as pitchdistilled from coal or other tar or such, as a more or less pureasphalt, however obtained, a quantity of dry pulverized clay. The amountof the clay to that of the bituminous composition varies according tothe quality or purity of the composition or use to which the product isto be put.

In a paving'composition, where ordinarily there are present stony ormineral ingredients, there would be required generally asomewhat smallerproportion of the prepared clay than in a roofing composition, forinstance; but the quality and purity of the bituminous composition mustbe considered and also its softness. Ordinarily for a paving compositionI employ from about thirty-five to fifty-five per cent. of the drypulverized clay-that is, where a comparatively pure asphalt is employed.IV here a pitch is used, the proportion of clay would be somewhat less,according to the percentage of free carbon present in the pitch. Theproportion would then vary from eighteen to thirty-five per cent. of theprepared clay to the pitch.

The prepared clay may be combined With the asphalt, tar, or otherbituminous product before, during, or after distillation, as may be mostconvenient or most desirable.

The value of the invention consists in the modifications of theconditions of use of bituminous compositions in that it increases therange of temperature in which the compositions retain their virtuewithout their defects-- that is, such compositions remain more uniformlyflexible and resilient at both extremes of temperature than would thebituminous material from which they are made, having less tendency tobecome brittle at lOW temperatures and to soften at high temperatures,but being for bituminous compositions remarkably uniform and stablebetween the ranges of ordinary atmospheric temperatures.

Having thus fully described myinvention, I claim and desire to secure byLetters Patent of the United States 1. Amethod of preparing a pavingmaterial consisting in thoroughly mixing with semiliquid bitumenfinely-pulverized clay,and stirring into the combination particles ofstone or Wearing material.

2. A sheet paving material consisting of wearing or strong ingredientscombined by an intimate mixture of bitumen and finelypulverized clay.

J. M. DOLAN, SAUL SIPPERSTEIN.

